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tiger barb school?

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Does anyone know what the optimal size school is. Currently there in a tank with 1 blue paradise gourami, 3 black skirt tetras, 2 cory cats ( going to get more), 1 pleco. There are currently 6 in the school.

The is no real upper limit to school size except for tank size and maintenance abilities. Consider that schools go by the thousands in the wild. Six is a good lower limit, but the upper number only is limited by what looks good in your eyes and how well you can keep up water quality with increased stock.
If you are looking for recommendations from members then tank size, filtration and maintenance will be very helpful

I would keep at least 6, so you are good with the minimum. In regards to the max, it all depends on fish tank and filtration like it was mentioned above. My 7 barbs swim happily in a 20g tall tank, they are 5 green tiger barbs and 2 albino tiger barbs. For the tank size that I have I would not add more since they need room for their full speed runs. Good luck!

Does anyone know what the optimal size school is. Currently there in a tank with 1 blue paradise gourami, 3 black skirt tetras, 2 cory cats ( going to get more), 1 pleco. There are currently 6 in the school.

I had a school of 20 in a 55 gallon. I initially had them with other fish but decided to keep them by themselves. With tiger barbs it is recommended for species only.